Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
FanDuel Racing - Bet on Horses
From the leader in Daily Fantasy and US Sportsbook comes FanDuel Racing
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
15,548 ratings · Top 5%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for FanDuel Racing - Bet on Horses: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Implement a simplified betting interface with one-tap betting options.
Assumption to check: Difficulty in placing bets quickly during live events
Validate with people who use this workflow before building.
Hypothesis 2
Enhance filtering features to improve race searchability.
Assumption to check: Limited filtering options for races
Validate with people who use this workflow before building.
Hypothesis 3
Ensure a consistent design and functionality across different screen sizes.
Assumption to check: Inconsistent user experience across devices
Validate with people who use this workflow before building.
Hypothesis 4
Provide tutorials or guides on how to place bets and understand odds.
Assumption to check: Lack of educational resources for new users
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
From the leader in Daily Fantasy and US Sportsbook comes FanDuel Racing. A simple and fun way to play the ponies. Watch every race live, get free tipping info, picks, and bet legally. Live streaming for 300+ tracks Use your existing FanDuel Sportsbook, Casino, and DFS login credentials Seamless deposits and withdrawals across FanDuel apps Enjoy thrilling promotions that take your winnings to new heights Bet on the biggest races like the Kentucky Derby, Preakness Stakes, Belmont Stakes, Breeders' Cup, and many others Access free expert picks, horse stats, and previous horse performances on every race If you're new to racing, we've got you covered. Our Horse Racing 101 guide makes it a breeze to get started and place your first bet With the FanDuel Racing app, you're never far from the action and securing that next big payday. Pick your favorite horse, watch them blow away the competition, and cash out quickly and securely. Our free app has you covered. Log in with any FanDuel app credentials, complete the simple verification, and you're off to the races! FanDuel Racing puts horse racing in your pocket 365 days a year! Don't miss out on the fun including unforgettable events from Saratoga, Del Mar, and Santa Anita plus big days from across the globe. Download the app now! Bet online today! Supports 300+ tracks including your local tracks. Questions? You'll find all the answers on our FAQ page: https://support.fanduel.com/s/racing?categories=%5B%22Product.FanDuel_Racing%22%5D FanDuel Racing: https://racing.fanduel.com Full Terms and Conditions: https://racing.fanduel.com/more#termsConditions Privacy Policy:https://racing.fanduel.com/more#privacyPolicy Contact Us: [email protected] To access the app you'll need a FanDuel account that is fully verified; you must be at least 21 years of age; a United States citizen or resident alien; a resident of a state where wagering services are available* and certify that the application information you provide is accurate. False statements made in regard to an application may subject the applicant to prosecution. FanDuel Racing will use the information provided by you and other data passively collected from you in our app for a variety of purposes as more particularly described in the FanDuel Racing Privacy Policy (available at https://racing.fanduel.com/more#privacyPolicy). For example, we use your information and data to complete your wager transactions and provide you with information such as to send you special offers or promotional and marketing materials. If you have questions about our information practices, please review the FanDuel Racing Privacy Policy or contact us at [email protected] AWARE – Always Wager Responsibly – National Gambling Helpline: 1-800-522-4700. *States where the FanDuel Racing App wagering services are available: Arkansas; California; Colorado; Delaware; Florida; Idaho; Illinois; Indiana; Kentucky; Louisiana; Massachusetts, Maryland; Michigan; Minnesota; Montana; New Hampshire; New Mexico; New York; North Dakota; Ohio; Oregon; Pennsylvania; Rhode Island; South Dakota; Virginia; Washington, West Virginia and Wyoming.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
react-navigation
react-native-reanimated
BUILD KIT DIFFICULTY
Expert
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
